package com.zsh.admin.interceptor;

import lombok.extern.slf4j.Slf4j;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * @author zsh
 * @Description 登录检查
 *                  1.配置好拦截器拦截哪些请求
 *                  2.把这些配置放在容器中
 * @create 2022-02-26 11:06
 */
@Slf4j
public class LoginInterceptor implements HandlerInterceptor {
    /**
     * 目标方法执行之前
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //登录检查逻辑
        log.info("拦截路径为："+ request.getRequestURI());

        HttpSession session = request.getSession();
        Object loginUser = session.getAttribute("loginUser");
        if (loginUser!=null){
            //放行
            return true;
        }
        session.setAttribute("msg","请先登录！");
        response.sendRedirect("/");
        //拦截
        return false;
    }

    /**
     * 目标方法执行之后
     * @param request
     * @param response
     * @param handler
     * @param modelAndView
     * @throws Exception
     */
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {

    }

    /**
     * 页面渲染之后
     * @param request
     * @param response
     * @param handler
     * @param ex
     * @throws Exception
     */
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

    }
}
